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A small, insulating, spherical shell with inner radius a and outer radius b is concentric with a larger insulating spherical shell with inner radius c and outer radius d. The inner shell has total charge +q distributed uniformly over its volume, and the outer shell has charge -q distributed...

ohh i understand now! thankyou@!

A point charge q1 -4 nC is at the point x = 0.600 m, y = 0.800 m, and a second point charge q2 +6 nC is at the point x = 0.600 m, y = 0. I need to calculate the magnitude of the net electric field at the origin due to these two point charges. |...

An electron is released from rest in a uniform electric field. The electron accelerates vertically upward, traveling 4.50 m in the first 3 us (microsecond??) after it is released. Part A What is the magnitude of the electric field? How would I calculate the magnitude of the electric field...

Then I would believe that both A and D are negatively charged and when placed near each other they will repel?

There is a ball (A) is carrying a uniformly distributed unknown charge(wich may be zero) and an uncharged copper ball (D). A positive test charge (T) experiences highly attraction with ball (A) and (D). What is the nature of the force between balls A and D if they are brought very close...

would f2 = the given 90 beats and f0 = the given frequency? 1.95x10^6? v = given speed of sound in body 1500 m/s after when i used those , i get an answer that is very very big.

I used the second equation that you have explained; however this time I get .069227 here is what I did 1500/(1500+Vheart) * 1.95x10^6 = 90 + 1.95*10^6 Am I using the equations incorrectly?

A sound wave travels at a frequency 1.95 Mhz through a pregnant woman's abdomen and is reflected from the fetal heart wall of her unborn baby. The heart wall is moving toward the sound receiver as the heart beats. The reflected sound is then mixed with the transmitted sound, and 90.0 beats per...

So the area is not a circle?

Lets say there is a small firecracker that emits 1200 of peak power. What is the peak intensity B in decibels at a distance of 1 m from the firecracker? This is what i have tried: B = 10log(I/Io) I = 1200/pi Since I = power/area and the area is pir^2, pi(1m)^2 Io=( 10^-12...

anyone please?

humm so the general formula for lambda should be ns right? so that would make Tension = (m/s)(nsf)^2 ? however, in this problem is it possible to find the value of n?

Whoops, I meant Tension = (m/s)((lambda)f)^2 From my notes, I have k= 2pi/(lambda) = 2pif/v Then I tried Since v = omega/k (m/s)(omega/k)^2 = Tension Since omega = 2pi/f (m/s)(2pif/k)^2 = Tension now I am stuck with k I can't seem to find a way that allows k or lambda...

For the first part, solving for T , I get Tension = (lambdaf)^2/(m/s) Second part, I am still stuck with (lambda)f Does this mean I have to solve for lambda in using terms such as the s?